<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- css样式编写 
    css语法：
      选择器{
         css属性名:css属性值;
      }
    
    display:inline; 标签(元素)转化为行内元素
    display:block;  标签(元素)转化为块级元素、显示元素
    display:inline-block; 标签(元素)转化为行内块元素
    display:none; 隐藏元素，不占空间****
    -->
    <style>
        h1{
            background-color: red;
            height:100px;
            width:100px;
            display: none;
            /* display:inline; */
            /* display: inline-block; */
        }
        span{
            background-color: blue;
            height:100px;
            display:block;
        }
        i{
            background-color: pink;
            height:100px;
            width:100px;
            display: inline-block;
        }
    </style>
</head>
<body>
    <h1>1111</h1>
    <h1>1111</h1>
    <h1>1111</h1>
    <span>222</span>
    <span>222</span>
    <i>333</i>
    <i>333</i>
</body>
</html>